Thread: Interesting Blade Shape...Advantages or Disadvantages?

Called double belly I believe.
If I am not wrong they were made with two different size wheels. I have seen theories, that it was not easy to get the hollow grind for the size with one wheel only so a large radius wheel was used to create more of a wedge grind, then a smaller radius wheel was used to get the hollow grind. Not sure if this is true or not.

Here some examples of the same.

This one is very subtle but it is there


This one has more pronounced double belly


The line in the middle of the blade is a result of the double belly

A lot of my hollow grounds have them. I usually see the line on the blade and can feel it with my fingers. On occasion I have seen it like you have in your OP. Never had a problem honing with them and find that I like the added strength it seems to give to the blade when shaving.

Originally Posted by mainaman

Called double belly I believe.
If I am not wrong they were made with two different size wheels. I have seen theories, that it was not easy to get the hollow grind for the size with one wheel only so a large radius wheel was used to create more of a wedge grind, then a smaller radius wheel was used to get the hollow grind. Not sure if this is true or not.

Here some examples of the same.

This one is very subtle but it is there


This one has more pronounced double belly


The line in the middle of the blade is a result of the double belly

That razor reminds me of a high heel shoe. Cool lines.

Originally Posted by Steel

That razor reminds me of a high heel shoe. Cool lines.

Shaves amazing too, but it needs some getting used to to the extreme smile.

Originally Posted by gssixgun

There is another possibility, hard to tell from your pic

But here is more info

http://straightrazorpalace.com/custo...al-scales.html

Wow, that's a killer razor you have there Glen.
Here's another pic from the side if that helps.

Originally Posted by mainaman

Called double belly I believe.
If I am not wrong they were made with two different size wheels. I have seen theories, that it was not easy to get the hollow grind for the size with one wheel only so a large radius wheel was used to create more of a wedge grind, then a smaller radius wheel was used to get the hollow grind. Not sure if this is true or not.

Here some examples of the same.

This one has more pronounced double belly

Thanks for the info. That blade looks insane!

Yes Doc what you have there is more like that Yankee Cutlery

Read the Patent link that Oz posted for even more info in #19 in that thread

http://straightrazorpalace.com/custo...tml#post854701


Read post #22 in that thread also

Originally Posted by gssixgun

Yes Doc what you have there is more like that Yankee Cutlery

Read the Patent link that Oz posted for even more info in #19 in that thread

http://straightrazorpalace.com/custo...tml#post854701


Read post #22 in that thread also

Very informative bit of reading. I like Mr. Korn's thought process. Does it seem to translate into improved face feel/shave quality as he suspected?

There certainly isn't any concave in the lower portion of the blade, and when I place a straight edge from the spine to the edge in the picture, there only fractions of a mm to the belly. It seems as though it would be very sensitive to any pressure on the hone due to this ridiculously small clearance. I'm wondering if the asymmetry in the belly shape is actually due to prior honing chewing into the belly. I guess I could tape the spine for a little more clearance when honing. Maybe I'm getting in over my head with this one.

Originally Posted by DocMartin0321

Maybe I'm getting in over my head with this one.

I think you are waaaaaay over thinking this. Treat it like a normal razor and hone it! I did that with a Korn American Double Hollow (very similar grind) and it shaves like a champ.

Given the wide flats along the spine it's quite possible that it started as properly made razor and it got there by excessive honing.

You are right, though, most of the time full hollow razors have the belly further from the edge. I think the pictures in the library are from razors without much hone wear, but when I put them I just picked the ones that looked sharpest and not brand new razors (it's fairly difficult to focus on the razor point with handheld point&shoot camera in medium light).
But I have plenty of brand new razors without excessive hone wear from the factory and that geometry in the pictures is representative for the vast majority of razors. There's probably the occasional odd one or mistakes, but the idea behind the double grind is achieving more hollowing so a belly close to the edge doesn't really accomplish that too well.

Also there's the asymmetry left-right i.e. with respect to a vertical plane - that's poor grinding (i.e. poor set up of the grinder with different size wheels on each side) no doubt about it.

The Union Cutlery 4 Points have a rather obvious belly also